I have a Flex 6300 with ATU. Does the new 6400 use the same ATU, or must I buy a new one?
That's incredibly short sighted. One would have hoped for an evolutionary design from the original Signature series. I bought this radio only 3 years ago when it was introduced at Dayton! Last one that they had at the show. This sets a new low for product obsolescence. I love my 6300 but am really pissed at Flex for the short product life.